CTV News' chief political correspondent Vassy Kapelos says Canada was notified this morning by the U.S. that China, Mexico and Canada will be subject to tariffs: 25 per cent across the board with the exception of energy, which will be 10 per cent.

It would take effect on Tuesday and would be in place until the fentanyl overdose issue is sorted.

Minister of Intergovernmental Affairs Dominic LeBlanc and Prime Minister Justin Trudeau will announce a Canadian response at 6 p.m. ET tonight.

A senior government source tells CTV News that Ottawa is expecting something formal at 2 p.m. EST. Cabinet is set to meet at 3 p.m. EST.